//go:build windows
// +build windows

/*
Copyright 2014 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

// Package app does all of the work necessary to configure and run a
// Kubernetes app process.
package app

import (
	"errors"
	"fmt"
	"net"

	// Enable pprof HTTP handlers.
	_ "net/http/pprof"

	v1 "k8s.io/api/core/v1"
	"k8s.io/kubernetes/pkg/proxy"
	proxyconfigapi "k8s.io/kubernetes/pkg/proxy/apis/config"
	"k8s.io/kubernetes/pkg/proxy/winkernel"
)

// platformApplyDefaults is called after parsing command-line flags and/or reading the
// config file, to apply platform-specific default values to config.
func (o *Options) platformApplyDefaults(config *proxyconfigapi.KubeProxyConfiguration) {
	if config.Mode == "" {
		config.Mode = proxyconfigapi.ProxyModeKernelspace
	}
	if config.Winkernel.RootHnsEndpointName == "" {
		config.Winkernel.RootHnsEndpointName = "cbr0"
	}
}

// platformSetup is called after setting up the ProxyServer, but before creating the
// Proxier. It should fill in any platform-specific fields and perform other
// platform-specific setup.
func (s *ProxyServer) platformSetup() error {
	winkernel.RegisterMetrics()
	// Preserve backward-compatibility with the old secondary IP behavior
	if s.PrimaryIPFamily == v1.IPv4Protocol {
		s.NodeIPs[v1.IPv6Protocol] = net.IPv6zero
	} else {
		s.NodeIPs[v1.IPv4Protocol] = net.IPv4zero
	}
	return nil
}

// platformCheckSupported is called immediately before creating the Proxier, to check
// what IP families are supported (and whether the configuration is usable at all).
func (s *ProxyServer) platformCheckSupported() (ipv4Supported, ipv6Supported, dualStackSupported bool, err error) {
	// Check if Kernel proxier can be used at all
	_, err = winkernel.CanUseWinKernelProxier(winkernel.WindowsKernelCompatTester{})
	if err != nil {
		return false, false, false, err
	}

	// winkernel always supports both single-stack IPv4 and single-stack IPv6, but may
	// not support dual-stack.
	ipv4Supported = true
	ipv6Supported = true

	compatTester := winkernel.DualStackCompatTester{}
	dualStackSupported = compatTester.DualStackCompatible(s.Config.Winkernel.NetworkName)

	return
}

// createProxier creates the proxy.Provider
func (s *ProxyServer) createProxier(config *proxyconfigapi.KubeProxyConfiguration, dualStackMode, initOnly bool) (proxy.Provider, error) {
	if initOnly {
		return nil, fmt.Errorf("--init-only is not implemented on Windows")
	}

	var proxier proxy.Provider
	var err error

	if dualStackMode {
		proxier, err = winkernel.NewDualStackProxier(
			config.IPTables.SyncPeriod.Duration,
			config.IPTables.MinSyncPeriod.Duration,
			s.Hostname,
			s.NodeIPs,
			s.Recorder,
			s.HealthzServer,
			config.HealthzBindAddress,
			config.Winkernel,
		)
	} else {
		proxier, err = winkernel.NewProxier(
			s.PrimaryIPFamily,
			config.IPTables.SyncPeriod.Duration,
			config.IPTables.MinSyncPeriod.Duration,
			s.Hostname,
			s.NodeIPs[s.PrimaryIPFamily],
			s.Recorder,
			s.HealthzServer,
			config.HealthzBindAddress,
			config.Winkernel,
		)
	}
	if err != nil {
		return nil, fmt.Errorf("unable to create proxier: %v", err)
	}

	return proxier, nil
}

// platformCleanup removes stale kube-proxy rules that can be safely removed.
func platformCleanup(mode proxyconfigapi.ProxyMode, cleanupAndExit bool) error {
	if cleanupAndExit {
		return errors.New("--cleanup-and-exit is not implemented on Windows")
	}
	return nil
}